<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width" />
    <title>菜鸟教程</title>
  </head>
  <body>
    <p>这是一个段落</p>

    <script>
      var a = 5;
      const b = 4;
      let c = 3;
      console.log("a=" + a + ",b=" + b + ",c=" + c);
    </script>
  </body>
</html>
